Improvement in spring-hinges for doors



lR.ADAMs.

Spring Hinges.

'l Patented Jun`e 20 levers of the pivot.

UNITED STATES `PATENT OFFICE.

ROBERT ADAMS, or BOROUGH or sOUTBIWARK, GREAT BRITAIN.

IMPROVEMENT IN SPRlNG-HINGES FOR I'JOOR'S.

Specification forming part of Letters Patent No. 116,002, dated June 20, 1871.

To all 'whom it may concern:

Be it known that I, ROBERTADAMS, of No. 25 Falmouth Road, in thegBo'rough of Southwark, in the county' of Surrey and Kingdom of Great Britain, have invented certain Improvements in'Spring-Hinges, ofA which the following is a specification:

v is to construct the hinge so that the door,when

closed or in itsmiddle position, may be iirnily held, notwithstanding wear.

-The construction which I adopt is as follows: The pivot `or vertical axis of the hinge works in bearings, so that it can freely turn more than a quarter of a revolution either way', and

is squared atv the upper part toreceive a lever or shoe, which is affixed to the lower angle of the door, which thus turns on and with-this pivot as an axis. The pivot or axis is mountved with a lever or levers, in which are two verticalgroov'es, one on either side ofthe said projecting lever or levers. These grooves receive the two ends' of a spring or springs. These springs are contained vin a box part of a circle in form. This box may also contain a vertical xed pin, having vertical grooves corresponding, to those in the projecting lever or I do vnot limit myself to any particular inode of xing these grooves, or the position they may occupy in the box;

. but I prefer iixing them at the back of the box; in which. case the spring encircles the pivot or axis, and the iixed stop placed to determine the distance. the projecting lever coming in contact therewith. The bar or fastener holding the spring v or, are inserted in the grooves iixed in the box, f

er they may be iixed in any other suitable way, thus bringing all the ixed grooves and4 the shown in Fig. 7.

The door may open by` grooves on the pivot in one position and .at rest. Now, when the pivot or axis is .made to turn either way by the door or lever, the springs will become expanded by the projecting lever of the' pivot'and leave the iixed groove of the box on one side or the other; and when the door or lever is let free ,the spring will bring it again into its original position and at rest. Theworking parts of hinges I cast in and on chills7 thus making them very hard, precise, and'durable. I also make'the lower part oi' the pivot or vertical axis Vsomewhat elliptical in form, rather V-shaped, and the chilled cup to correspond'in shape, so that when in its middle or closed position extra ei'- fort is required to displace it. Iprei'er raising the cup and thus attaching the stop to the lower part of the vertical'grooves.

Description of Drawing. Y

gure l is a sectional plan of hinge taken on the line c d, Fig. 2. Fig. 2 is alongitudinal section of hinge taken on the line c j', Fig. l.

Fig. 3 is a sectional view of hinge without slots for nuts, as shown in Figs. l and 2. Fig.l 4 is a sectional planof hinge iwith long leverage, and showing the vertical grooves in front, with a friction-roller at the back. Fig. 5 is a longitudinal section of an adjustable shoe;

Fig. 6, a sectional plan of the above Fig. 5;

Fig. 7, a sectional plan of a rabbet-i'ramed doorshoe; Fig. 8, a longitudinal section of the'shoe,

O is the case or box, which is let into the sill of the door in the usual way, and covered by the plate K. His a vertical stop, connecting bythe cup'and box the vertical grooves P, in which the ends of the spring I are placed. N vis a flange, sometimes, with slots lVI, Fig. l,for screws L, to secure the top plate K, allowing the box to be turned-regardless ofthe cover K. S q are slots .and vertical slips for the xingand adjusting by screws or wedges. The vertical groovesl on the lever V ofthe pivot G correspond with the vertical grooves P, shown in Fig. Z, thus bringing all the grooves onthepivot G and in the box O in line when the spring I is at rest, asshown in Figs. l and 4.

Figs. 5 and 6 show an adjustable shoe, by

means of av movable boss, which hasa hole' squared through to receive the axis G. This either direction by the direct action of the pinboss or bush is moved and xed by operattle, furnished with lugs for that purpose.

ing on the screws 1', and so altering the posi- Witnesses: ROBT. ADAMS. tion of the door. H. I. HADDAN,

I claim- -67 Strand, W. 0., London The circular spring, resting at both ends F. MAYIIEW,

against the lug on the box, and operated in 67 Stra/nd, London'. 

